frequency response

[canelhas]

I need to make sine waves with different frequencies, ranging above 20 kHz, synthesize them taking the noise out of it through filter designs,

I want to know if adobe audition fits the ultrasonic waves, like 30kHz - 70kHz of frequency response?

I just see graphics ranging till 22kHz

best regards

Diego

[SteveG_AudioMasters_]

It does, but you need to be aware of what Nyquist's sampling theorem tells you. And that is that in order to reproduce any frequency, you need the sampling rate of your file to be twice this at a minimum. So if you want to make a sine wave with a frequency of 70kHz, you need a sample rate of at least 140k. Sample rates come in fixed standard sizes, and the next ones above this are 176.4k and 192k, so your generated file would have to be at one of those rates. That's the easy bit, and yes Audition will do this. What's not so easy is that in order to reproduce these files, you'll need a sound device that can handle these rates, and with a flat(ish) response way beyond the audio range. They are available, but not that cheaply. I would not expect any built-in sound device in a laptop to be able to get anywhere near this level of performance, FWIW.

But when you generate any file, you'll always find the frequency is limited to half of the sample rate of it, whatever it is. So 44.1k files will, as you've observed, only show frequencies up to 22.05kHz.

[canelhas]

thanks for you prompt reply,,

I purchased the adobe audition but I cannot find a way to do my tone pips

I already set up like you advised,

I think what I need is simple for you,

I need to do mixes of sine waves with different ultrasonic frequency responses (30-70kHz)

then I need to windowing with 1ms rise and fall time 1ms plato mixed

and a 15-20 Hz (repetition cycle)

and I need to synthesize, I mean, when we mix frequencies waves we spread noise

how do I do that?

my best regards,

Diego

[SteveG_AudioMasters_]

I'm afraid that Audition isn't really the software you need - it's intended for audio production purposes rather than analysis of that nature, and doesn't have the tools you'd require for it. Yes, you could use it to generate the tones internally as you don't need a sound device to do this, but beyond that, it won't synthesise anything and certainly doesn't do that sort of windowing.